Results 141 to 150 of about 277 (174)
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A field perspective on modelling‘single-ridge’ ice-wedge polygons
Permafrost and Periglacial Processes, 2004AbstractPlug and Werner (Nature 2002, vol. 417, pp. 929–933) have constructed a model for the growth of ice‐wedge polygons. Contrary to field evidence, the model describes development of ice wedges in frozen ground beneath a centre line of ridges and assumes that effects associated with perturbations in the thermal stress field due to growth of ...
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Ice‐wedge casts and relict polygonal patterns in Scandinavia
Journal of Quaternary Science, 1988AbstractIce‐wedge casts in Scandinavia frequently occur in three regions: (a) southwestern Jutland (outside the limit of the Weichselian glaciation); (b) southwestern Sweden; and (c) northernmost Norway. The latter two areas are both early deglaciated regions.
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Ice-wedge polygons and solifluction in the Adventdalen area, Spitsbergen, Svalbard
Norsk Geografisk Tidsskrift, 2002In the Adventdalen area, ice-wedge polygons are numerous from sea level up to altitudes of at least 500 m a.s.l. In higher areas, polygons are found in weathering material, mostly on bedrock Cretaceous in age or older. Many polygons are found on slopes inclined up to at least 25°.
L. Sørbel, J. Tolgensbakk
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Zonal peculiarities of polygonal ice‐wedge relief in Western Siberia
Polar Geography, 1979Abstract The polygonal ice‐wedge formations of Western Siberia have a marked zonality. This is manifest in the morphological characteristics of the ice‐wedge polygon relief, associated with various stages of development of the ice wedges, i.e., those of growth, preservation, melting, and, finally, a residual stage.
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Imaging a Polygonal Network of Ice-Wedge Casts with an Electromagnetic Induction Sensor
Soil Science Society of America Journal, 2011Images of the morphology of a polygonal network of ice-wedge casts are a valuable aid to paleoclimatological reconstructions. Usually such images are obtained by aerial photography showing polygonal crop marks refl ecting textural diff erences between wedge fi lling and host material.
Eef Meerschman +7 more
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Norsk Geografisk Tidsskrift, 2005
Scandinavian networks of relict ice wedge polygons are revealed by aerial photographs, (a) on the Swedish west coast and in south-western Jutland, Denmark, as vegetation patterns (crop marks) during dry seasons, and (b) in north-eastern Norway, as a pattern of shallow trenches enhanced by vegetation. The most regularly shaped and equally sized polygons
Harald Svensson
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Scandinavian networks of relict ice wedge polygons are revealed by aerial photographs, (a) on the Swedish west coast and in south-western Jutland, Denmark, as vegetation patterns (crop marks) during dry seasons, and (b) in north-eastern Norway, as a pattern of shallow trenches enhanced by vegetation. The most regularly shaped and equally sized polygons
Harald Svensson
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Late Wisconsinan Ice-Wedge Polygons near Kitchener, Ontario, Canada
Canadian Journal of Earth Sciences, 1972Reconnaissance from a light aircraft has revealed areas of polygonal ground east of Kitchener, Ontario. Examination of aerial photographs of the same region has shown additional polygons all developed upon Port Stanley II Till. Trenching of a polygon has exposed wedge-shaped sand and gravel infilled structures interpreted as ice-wedge casts.
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Fossil ice-wedge polygons in the Colorado Front Range: Origin and significance
Geological Society of America Bulletin, 1979Polygonal patterned ground in a tundra valley near Sawtooth Peak, Boulder County, Colorado, is unique in the Front Range because of its large size and its resemblance to fossil ice-wedge polygons. The polygons occur in a terminal moraine of latest Pinedale age (about 15,000 to 10,000 B.P.), at an altitude of 3,390 m.
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Ice wedges (IWs), one of the most widespread landforms and most abundant forms of ground ice in the Arctic, form complex landscape mosaics. Characterizing IWs and their distribution is essential to provide improved understanding of landscape-scale hydrology and associated processes in a warming climate.
Roxanne Frappier +3 more
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Roxanne Frappier +3 more
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Ecotypic Differentiation in Carex Aquatilis on Ice-Wedge Polygons in the Alaskan Coastal Tundra
The Journal of Ecology, 1979(1) Growth and nutrient relations of Carex aquatilis were examined in the field and in glasshouse-grown plants from five polygon microhabitats in wet meadow tundra at Barrow, Alaska. These habitats can occur within 1 m of each other, and differ greatly in soil moisture, availability of N and P and thaw depth.
G. R. Shaver +2 more
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